[AArch64] Use gen_frame_mem for callee-saves
The frame code uses a mixture of gen_rtx_MEM and gen_frame_mem for callee-saves. Callee-saves never alias with local variables, so using gen_frame_mem is best. gcc/ * config/aarch64/aarch64.c (aarch64_pushwb_single_reg): Use gen_frame_mem. (aarch64_pop_regs): Likewise. (aarch64_gen_load_pair): Likewise. (aarch64_save_callee_saves): Likewise. (aarch64_restore_callee_saves): Likewise. From-SVN: r250919
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